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Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Depreciation over life to cost of revenues and selling and administrative expenses, years	6 years
Net book value of internally manufactured test systems sold	$ 9.7ter_BookValueOfInternallyManufacturedTestSystemsSold	$ 9.0ter_BookValueOfInternallyManufacturedTestSystemsSold	$ 6.0ter_BookValueOfInternallyManufacturedTestSystemsSold
Advertising costs	1.9us-gaap_AdvertisingExpense	1.7us-gaap_AdvertisingExpense	1.6us-gaap_AdvertisingExpense
Gains and losses on foreign exchange contracts	$ 0.9us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	$ 6.9us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	$ 4.5us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Exercise price	$ 5.48invest_InvestmentOptionsExercisePrice
Call option, shares	34.7us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Warrant price	$ 7.67us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Percentage of common stock price	85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent	85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent	85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Stock options term	7 years
Test Systems Leased By Customers
Summary Of Significant Accounting Policies [Line Items]
Depreciation over estimated useful life, years	4 years
Stock Options
Summary Of Significant Accounting Policies [Line Items]
Percentage of common stock price	100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Period of stock granted to employees and executive officers vest in equal annual installments	4 years

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- Definition

Exercise price of the option.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Footnote 5

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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-Topic 720

-SubTopic 35

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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